Method strip

common/jinja/string.cpp:163–211

    });
}
string string::strip(bool left, bool right, std::optional<const std::string_view> chars) {
    static auto strip_part = [](const std::string & s, bool left, bool right, std::optional<const std::string_view> chars) -> std::string {
        size_t start = 0;
        size_t end = s.length();
        auto match_char = [&chars](unsigned char c) -> bool {
            return chars ? (*chars).find(c) != std::string::npos : isspace(c);
        };
        if (left) {
            while (start < end && match_char(static_cast<unsigned char>(s[start]))) {
                ++start;
            }
        }
        if (right) {
            while (end > start && match_char(static_cast<unsigned char>(s[end - 1]))) {
                --end;
            }
        }
        return s.substr(start, end - start);
    };
    if (parts.empty()) {
        return *this;
    }
    if (left) {
        for (size_t i = 0; i < parts.size(); ++i) {
            parts[i].val = strip_part(parts[i].val, true, false, chars);
            if (parts[i].val.empty()) {
                // remove empty part
                parts.erase(parts.begin() + i);
                --i;
                continue;
            } else {
                break;
            }
        }
    }
    if (right) {
        for (size_t i = parts.size(); i-- > 0;) {
            parts[i].val = strip_part(parts[i].val, false, true, chars);
            if (parts[i].val.empty()) {
                // remove empty part
                parts.erase(parts.begin() + i);
                continue;
            } else {
                break;
            }
        }
    }
    return *this;
}

} // namespace jinja